tec- ""Perhaps we should retitle this.... Confession of a Bad Beekeeper*. Good beekeeper of course DO NOT ALLOW their bees to swarm.... there are of course none of these on this forum""
Now tec! if I didn't enjoy your presence and great knowledge on this forum so much, I would just have to take this personal

the factors in my story are this:
1) We, here in upper CA are having unseasonably warm weather, usually we have snow and slush just like many of the others on this forum. I started feeding a month ago, and that really bulked up the hive sooner than I was ready.
2) Just two days ago, I was in the hive, 2 deeps, with a full inspection. I found that the upper box was brood bound and had 6 queen cells, and the bottom box was just half if not less the brood as the top box, with plenty of egg laying space for the queen. So! To prevent a swarm... I swapped a bunch of frames to give balance and opportunity to give them more room, and to buy me a couple of days to prepare for a split.
But Alas! the bees were already in swarm mode and beat me to the punch. Fortunately, I stepped into the backyard when the swarm was first starting. I like to believe that the bees were trying to tell me to "get my butt in gear girl! It's going to be a very busy day!"
Because I spent the entire winter reading on this forum, excellerating my posts to over 1,000, I had enough info to act on instinct and not stand in the backyard scratching my head wondering what to do with a swarm... like last year.
Thanks everyone for hanging tight with me yesterday! We all saved the bees and the day! I am most Grateful ~hugs~